user@host instead of user@domain

PartnerNOC

Lately, cpanel is sending messages to the wrong address.
When tries to alert a client that his mailbox is almost full, is sending a message to user@host instead of user@domain.tld which, of course, returns Unrouteable address

PartnerNOC

Please check what you have given as the main contact address in the accounts cpanel. That could be a reason why mail is going for some wrong address.

Regards,

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in whm when listing accounts, ALL accounts have as contact user@hostname and that will send an email to the user x hosted on the server. the email will get in the main account email. but why does returns unroutable address? the user exists so it shouldn't be a problem.